There is a product called helicoil that is used to replace worn threads in metal. You will probably find it at an auto parts store.
A muffler shop can replace the nut the O2 sensor screws into. A friend of mine has a shop and does it regularly.
No, simply check the bolt threads for an hour glass shape. If it has this THEN replace bolts
It is a B&S 397974 or 493017. It vents past the threads, so it needs to be the original or aftermarket replacement.
The knuckle could be heli-coiled if the damage is not too bad. If the stripped threads are on the caliper, replace the caliper.
To remove the sensor, turn it counter clockwise. Be sure to coat the threads with anti-seize compound when replacing.
No way to fix that - your tank is scrap.
Worn threads will cause this. Wrap your the threads on your oil pressure sending unit / switch with teflon tape, replace and tighten securely.
You screw the drain piece out of the tub. Not easy,as there are many threads on it. You can get a special tool for it in plumbing stores.
Replace the sending unit. Approx. $30 at parts store. I just replace one in my 1992 Wrangler. Requires a special socket ($12.) you can also use teflon tape and wrap the threads. Rarely do the leak around the threads, replace it before it creates bigger problems.
If the sensor is stripped you will have to replace it. If the fitting or hole it threads into is stripped it is likely you can make oversize threads and use a fitting called a bushing to repair it. Mind you I got desperate one night and epoxied one in. Its still working but if I ever have to change it I am toast.
If the bolts are in good condition you can re-use them. Examine the threads for nicks or a worn shoulder, make certain that the bolt turns freely into the cam. If you decide to re-use it, make sure that you clean it well and add a drop or two of locktite or equivalent.
because it is no good, replace it! Leaking at the threads or the unit is defective.
Depends. Did the threads tear out of the lid? If so, you could possibly drill it bigger, tap in new threads for an adapter and put a new valve in. Just checking, the gauge or the little rubber safety valve? If it is just the rubber safety plug, then yes, it should be possible to replace it. That's what it's there for.